JP4927198B2 - System for error management of program specific information in video decoder - Google Patents

System for error management of program specific information in video decoder Download PDF

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JP4927198B2
JP4927198B2 JP2010131081A JP2010131081A JP4927198B2 JP 4927198 B2 JP4927198 B2 JP 4927198B2 JP 2010131081 A JP2010131081 A JP 2010131081A JP 2010131081 A JP2010131081 A JP 2010131081A JP 4927198 B2 JP4927198 B2 JP 4927198B2
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program
specific information
data
information
version number
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JP2010206840A (en
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エドワード クロッフェンシュタイン スコット
リチャード シュナイドウェンド ダニエル
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トムソン ライセンシングThomson Licensing
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/84Generation or processing of descriptive data, e.g. content descriptors
    • H04N21/8402Generation or processing of descriptive data, e.g. content descriptors involving a version number, e.g. version number of EPG data
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/434Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4345Extraction or processing of SI, e.g. extracting service information from an MPEG stream
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47End-user applications
    • H04N21/482End-user interface for program selection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/44Receiver circuitry
    • H04N5/4401Receiver circuitry for the reception of a digital modulated video signal

Description

(background)
The present invention relates to the field of digital signal processing, and more particularly to the processing of incomplete program-specific information used to acquire and decode packetized video, audio, and other information.

  In video broadcast and processing applications, digital video data is typically encoded to comply with the requirements of well-known standards. The MPEG2 (Moving Pictures Expert Group) image coding standard is widely adopted as such a standard. In the present specification, this is hereinafter referred to as “MPEG standard”. The MPEG standard consists of a system coding part (ISO / IEC 13818-1 June 10, 1994) and a video coding part (ISO / IEC 13818-2 January 20, 1995). Data encoded according to the MPEG standard typically takes the form of a packetized data stream containing the data content of many program channels (eg, content corresponding to cable television channels 1-125). In addition, some digital services and channels may occupy a frequency band previously occupied by a single analog channel. The 6 MHz bandwidth previously allocated to analog NTSC compatible broadcast channels can now be divided into multiple digital subchannels to provide a variety of services. For example, the broadcast band of the RF channel 13 can be allocated to sub-channels including a main program channel, a financial service channel providing stock prices, a sports news service channel, a shopping and interactive channel. In addition, data carried in different subchannels may have different data formats (for example, analog, digital, etc.).

International Publication No. 97/46010 Japanese Patent Laid-Open No. 10-21299

Digital Communication, Lee and Messerschmidt (Kluwer Academic Press, Boston, MA, USA, 1988)

  In such digital video systems, there are a number of problems with the processing of auxiliary program specific information used to acquire and decode packetized data, for example for display on a television. Ancillary program specific information includes data used to identify and combine packets containing the selected program, and also includes program guide and text information associated with the transmitted program data. . The auxiliary program specific information is obtained from various broadcasting sources such as ABC, CBS, NBC, etc., and is packetized data together with program content data of many program channels (for example, channels 1 to 125). It is collated and transmitted as complex program specific information in the form of a stream. As a result of this processing, auxiliary program specific information received by the video decoder after transmission may contain errors. This error can occur through the matching process, or by misunderstandings or incompatibilities of the broadcast station, and can also be caused by data corruption caused by the transmission process itself. In accordance with the principles of the present invention, the system obtains and processes auxiliary program specific information to mitigate problems caused by such errors.

(Overview)
The processing system decodes the packetized program information including auxiliary program specific information including a plurality of information tables arranged in a hierarchy. Ancillary information is used to obtain and decode packetized program information and provide a video program for display. In this processing system, the version number of the first table of program specific information (for example, virtual channel table (VCT) or channel information table (CIT)) and the corresponding second table (for example, master guide table (MGT)). )), Which uses a method involving detection of inconsistency with the version number of the first table conveyed. If a mismatch is detected, force the first and second tables to include compatible first table version numbers. Program specific information including first and second tables that include compulsory compatible version numbers is used to decode the packetized program information and provide the video program for display. .

  Another feature allows decoding of packetized program information by ignoring detected discrepancies. In addition, the user's channel lineup is edited to remove error conditions in the channel associated with the detected discrepancy or other program specific information.

FIG. 5 is an exemplary master guide table (MGT) that carries the version number of the program specific information table. FIG. 3 is an exemplary virtual channel table (VCT) diagram including its own version number. 4 is a flow diagram of a method for managing error conditions when processing program specific information for video and audio decoding applications according to the present invention. FIG. 4 is a diagram of a decoder system that decodes packetized program information using the process of FIG. 3 in accordance with the present invention.

(Detailed description of the drawings)
Program specific information (PSI) includes program guide data and information used in identifying and assembling individual data packets to reproduce the contents of the selected program channel. Program-specific information can be carried in an MPEG-compliant format (MPEG system standard, section 2.2.4), or the Program and System Information Protocol for Terrestrism published by the Advanced Television Systems Committee (ATSC) on December 23, 1997. and Cable (hereinafter referred to as PSIP standard or other ATSC standard). Further, the data structure elements can be formed according to specific system ownership or custom requirements. Program specific information is usually built into a number of hierarchically arranged and linked tables. The table consists of a series of data and parameters used to enumerate and describe a set or sequence of TV channels, TV programs, channel parameters, program parameters, their corresponding multimedia objects and object parameters, and the like. An exemplary PSIP hierarchical table configuration includes a master guide table (illustrated in the PSIP-compliant MGT in FIG. 1), a virtual channel table (illustrated in the PSIP-compliant VCT in FIG. 2 such as VCT-1 and VCT-2), and an event information table (EIT). -1, EIT-2), and an optional table such as an extended channel information table (EVCT-1, EVCT-2, EVCT-3), a network information table (NIT), and an extended event information table (EEIT-1, EEIT- 2).

  The MGT (illustrated in FIG. 1) contains information used to obtain program specific information carried in other tables including VCT (illustrated in FIG. 2). In particular, the MGT includes a list containing the version number, length, and packet identifier (PID) of all other PSIP tables being transmitted on the individual channel. The other tables also contain their respective version numbers, which should match the corresponding version numbers carried in the MGT during normal operation. The VCT includes an attribute list of channels carried in a particular transport stream, and includes tuning and navigation information for receiving program channels selected by the user. The EIT includes a description list of programs (events) that can be received on the channels listed in the VCT. Any of the VCT, EIT or other tables can be used to carry information for the user to select and tune a particular program. VCT is typically used to carry parameters for obtaining audiovisual program content data that is constant throughout several events (TV programs). EIT is typically used to carry audiovisual program content data parameters that are constant for an event (individual TV program). The NIT (option table) includes a parameter list of the entire broadcasting network (terrestrial, satellite, cable, etc.). EVCT and EEIT are extended tables that contain additional VCT and EIT information. Additional program specific information that describes and supplements the items in the hierarchical table is carried in a descriptor information element.

  The inventor recognizes that a problem may occur when performing a validity check for version number matching between individual program specific information tables. VCT validation includes, for example, comparing the VCT version number carried within the VCT itself with the corresponding VCT version number carried within the MGT. Similar validity checks are performed on other program specific information tables. Version number mismatches can occur for several different reasons. For example, a broadcaster may mistakenly send MGTs and VCTs that do not match version numbers but are valid in all other respects. Alternatively, if the program specific information table is updated before acquiring the MGT and acquiring the VCT, a mismatch of version numbers may occur. The updated table contains the new version number, so that the MGT will carry a VCT version number that is older than the acquired VCT version number. Version number mismatches can also occur due to data corruption in the transmission or acquisition process and other procedures.

  In the decoding system, for example, if a version number mismatch is detected between MGT and VCT, the VCT can be reacquired with one initial response. Since the MGT has a higher monitoring frequency and is often the latest value, the VCT is usually reacquired instead of the MGT. Since the MGT contains an index of the version numbers of the other tables, the MGT is more frequently monitored, and therefore uses the MGT efficiently to determine which other tables need to be changed and reacquired it can.

  If a broadcaster erroneously sends MGT and VCT numbers that have version numbers that do not match but are otherwise valid, this discrepancy is not resolved by VCT or MGT reacquisition. This is because in this case, MGT does not match VCT. As a result, a failure mode including continuous reacquisition of VCT or MGT may be generated. In contrast, if a version number mismatch occurs because of an update of the program specific information table between acquisition of MGT and VCT, the mismatch is successfully resolved by re-acquisition of VCT. However, VCT reacquisition is further delayed when the version number mismatch is resolved. VCT reacquisition successfully resolves version number discrepancies caused by data corruption in the MGT and VCT transmission or acquisition processes (although there is a delay). Once the version number mismatch is resolved, channel information can be retrieved from the VCT and used for tuning and navigation to receive the user selected program channel.

  The inventor finds that the problem of version number mismatch and associated reacquisition delay is advantageously the version number of the VCT (or other table) version number carried in the MGT (or other table). We recognize that we can minimize or eliminate it by forcing the number to match. In particular, the MGT can be changed in memory when the VCT (with a different version number corresponding to the version number carried in the MGT) is first acquired. Therefore, when the validity check between MGT and VCT is performed, the version numbers match, and the channel information from the VCT can be used to acquire the channel. In another embodiment, VCT information is used for channel acquisition, ignoring version number mismatches, provided that there is no other indication of corruption leading to unavailability of VCT or MGT data.

  The principle of the present invention can be provided to a terrestrial, cable, satellite, Internet or computer network broadcasting system in which program-specific information having a hierarchical structure is transmitted and received. Such systems can include non-MPEG compliant systems including, for example, other types of encoded data streams and other methods of carrying program specific information. Such other methods may use transport structures including, for example, MPEG-PSI, Internet TCP / IP (Transfer Control Protocol / Internet Protocol), DSS (Digital Satellite System), ATM (Asynchronous Transfer Mode), etc. it can. Further, although the disclosed system has been described as processing broadcast programs, this is merely an example. The term “program” refers to any form of packetized data such as, for example, voice data, telephone messages, computer programs, Internet data, or other communications.

  FIG. 3 shows a flow diagram of a method for managing version number mismatches and other error conditions when processing program specific information for video and audio decoding applications. The method of FIG. 3 is used to process the exemplary PSIP-compliant MGT and VCT of FIGS. 1 and 2, respectively. The VCT processed in FIG. 3 associates an RF or physical transmission channel (PTC) with a subchannel (also called a virtual or logical channel). Each physical transmission channel (PTC) is assigned a bandwidth of 6 MHz and includes, for example, up to six subchannels. The process of FIG. 3 is used in the decoder in obtaining program specific information including PSIP compliant MGT and VCT. The acquired program specific information is used to acquire the subchannel selected by the user and the corresponding PTC. The process of FIG. 3 is used each time program specific information is updated. The program specific information is normally updated regularly, but is updated even if the user selects a new channel of a PTC different from the currently selected PTC. If the user selects another subchannel associated with an already selected PTC, there is no need to confirm the new VCT.

  Following the start step 250 of FIG. 3, at step 253, the version number in the program specific information table is compared with the corresponding version number carried in the MGT to detect any inconsistencies. In particular, the VCT version number (item 140 in FIG. 2) is compared with the corresponding VCT version number (item 135 in FIG. 1) carried in the MGT.

  If a mismatch is detected, in step 255, the VCT (and / or MGT) is reacquired a limited number of times until the version number mismatch is resolved. In another embodiment, an earlier version of VCT or MGT that results in a version number match in response to a detected mismatch can be used. Alternatively, step 255 may be omitted and the process continued at step 257.

  In step 257, in response to the detected discrepancy (with or without table re-acquisition in step 255), the VCT version number and the corresponding version number carried in the MGT are conveniently forced to match. It is done. This can be done by replacing (or rewriting) the VCT version number carried within the MGT with the VCT version number carried within the VCT itself. Alternatively, this can be done by replacing (or rewriting) the VCT version number carried in the VCT with the VCT version number carried in the MGT. Therefore, when MGT and VCT validation is performed, the version numbers match and channel information from the VCT can be used for subsequent channel acquisition. As an alternative, both the VCT version number carried within the MGT and the VCT version number carried within the VCT itself can be set to a common value different from any original version number. This common version number can be used to indicate that a mismatch condition occurred during VCT acquisition for a particular physical transmission channel. In addition, the common version number is used to trigger a special error detection and / or correction processing application to the VCT (or MGT) so that the VCT (or MGT) is not disabled due to data corruption Can guarantee.

  In another embodiment, at step 257, the detected version number mismatch is ignored and the VCT information is used for channel acquisition even if there is a version number mismatch. However, in another embodiment, in the absence of other error indications (illustrated in step 260 below) of VCT or MGT data corruption leading to unavailability, the version number mismatch is simply ignored.

  The packetized program information is verified in step 260 for an error indication. In particular, packetized program information (including program specific information) includes (a) MPEG continuous count error, (b) MPEG discontinuity error, (c) MPEG transport error, and (d) fluctuation between successive time stamps. It is verified whether there is an error indicated by. These indicators are defined within the MPEG system standard (eg, in section 2.4.3.5 and elsewhere), or error indicators are derived from MPEG-compliant parameters. When such an error condition occurring on a particular physical transmission channel or a table version number mismatch condition is detected, it is recorded in the database at step 263. In particular, the database is updated at step 263 to associate a particular subchannel and its corresponding physical transmission channel with a detected error or mismatch condition.

  At step 265, decoding of the packetized program information is prohibited for physical transmission channels associated with version number mismatches or other error conditions indicated by the database. Thus, if a version number match is forced or ignored at step 257 and no error condition is detected at step 260, the packetized program information is decoded at step 265 and can be played back on a display or audio device. A program is provided. In step 270, the database may further be used to remove channels associated with version number mismatches or error conditions from the user's channel lineup. Channels associated with fault conditions can be deleted from the user's viewable channel lineup displayed in the form of an electronic program guide (EPG) or in the form of another channel list. Alternatively, the channel associated with the fault condition can be identified to the user (and can indicate that the channel cannot be acquired) by visual display in the EPG or other channel list as corresponding to the fault condition. Such fault indications can be advantageously used in diagnostic or tuning procedures. The process of FIG. 3 can be used as part of a scanning process to initialize a video decoder, for example, to determine the available channel lineup for a user at a particular geographic location. The process of FIG. 3 ends at step 275.

  FIG. 4 shows a block diagram of a digital video decoding system that decodes packetized program information using the process of FIG. In particular, the system of FIG. 4 demodulates and decodes broadcast (terrestrial, satellite, cable or internet) signals. In terrestrial mode, a carrier signal modulated by a program carrying typical MPEG-compliant audio, video and related data of a program received by antenna 10 is converted to digital form and processed by input processor 13. The The processor 13 includes a radio frequency (RF) tuner, an intermediate frequency (IF) mixer, and an amplification stage that downconverts the input signal to a lower frequency band suitable for subsequent processing. In this exemplary system, the terrestrial input signal received by antenna 10 includes 125 physical transmission channels (PTC0-124). Each physical transmission channel (PTC) is assigned a bandwidth of 6 MHz and includes, for example, up to six subchannels.

  For example, assume that a video receiver user selects a sub-channel (SC) for viewing using the remote control unit 70. The processor 60 uses the selection information provided from the remote control unit 70 via the interface 65 to appropriately set the elements of the decoder 100 to receive the PTC corresponding to the selected subchannel (SC). The output signal from the PTC unit 13 selected according to the down conversion has a bandwidth of 6 MHz. In the following description, an RF channel or physical transmission channel (PTC) refers to an allocated broadcaster's transmission channel band that includes one or more subchannels.

  The processor 60 configures the unit 13 radio frequency (RF) tuner, intermediate frequency (IF) mixer, and amplification stage to receive the selected PTC using bidirectional control and signal bus C. The downconverted output frequency of the selected PTC is demodulated by unit 15. The basic functions of the demodulator 15 are to reproduce and track the carrier frequency, to reproduce the transmitted data clock frequency, and to reproduce the video data itself. The unit 15 corresponds to the transmitter clock and regenerates a sampling clock and a synchronization clock used for timing the operation of the processor 13, the demodulator 15 and the decoder 17. The reconstructed output from unit 15 is provided to decoder 17.

  The output of the demodulator 15 is associated by the unit 17 with a byte-length data segment according to a well-known principle, deinterleaved, and error corrected using a Reed-Solomon code method. In addition, unit 17 provides processor 60 with an indication of validity or locking of forward error correction (FEC). The Reed-Solomon error correction method is a well-known type of forward error correction. The FEC lock indication signal indicates that the Reed-Solomon error correction method is providing a valid output in synchronization with the data being corrected. The demodulator and decoder functions performed by units 13, 15 and 17 are well known individually and are outlined, for example, in the references Digital Communication, Lee and Mescherschmidt (Kluwer Academic Press, Boston, MA, USA, 1988). It is.

  In other modes, satellite, cable and internet data are received on input lines 11, 14 and 18 and processed by interface access modules 74, 78 and 72, respectively. Interface modules 74, 78, and 72 incorporate interface functions in satellite, cable, and internet data formats, respectively. Such functions are well known and are detailed in the relevant standards and other documents. These interface functions correspond to the functions performed by units 13, 15 and 17 in the ground mode. Further, in a manner similar to terrestrial mode, processor 60 configures units 74, 78, 72 and decoder 100 to receive satellite, cable or Internet data using bidirectional control and signal bus C. The decoder 100 processes the data coordinated by the units 74, 78 or 72 in these other modes using functions similar to those described in the terrestrial mode.

  The corrected output data from unit 17 is processed by an MPEG compliant transport processor and demultiplexer 22. Individual packets containing either the content of a particular program channel and program specific information are identified by their table identifier (table ID) and / or packet identifier (PID).

  The processor 22 separates the data by type based on the analysis of the packet identifier (PID) contained in the packet header information and provides synchronization and error indication information used for subsequent video, audio and data decompression. To do.

  The corrected output data provided to the processor 22 is in the form of a transport data stream that includes program channel content and program specific information for a number of programs distributed over several subchannels. In this illustrative example, the program specific information describes the subchannels that are in the transport stream for a particular PTC. However, in another embodiment, the program specific information also describes subchannels carried in different transport streams in other PTCs. These subchannel groups are either in that the source of these groups is a specific broadcaster or that they occupy the transmission bandwidth previously assigned to analog NTSC compliant broadcast channels It is associated. In addition, individual packets including the selected program channel in the transport stream are identified and assembled by the processor 60 operating in conjunction with the processor 22 using the PID included in the program specific information.

  The program specific information is acquired from the data stream input from the unit 17 and assembled by the processor 60 operating in cooperation with the unit 22. The processor 60 determines from the FEC lock instruction provided by the unit 17 that valid data is provided to the transport processor 22. Therefore, the program specific information table MGT and the VCT table are identified and assembled using a predetermined table ID and PID value stored in the internal memory of the processor 60. Using control signal C, processor 60 sets transport processor 22 to select a data packet that includes the remaining program specific information including EIT, ETT, and NIT data. Each table is a different source (eg, satellite, cable, or Internet source) with different data formats and transmission protocols over different transmission media such as satellite dish 11, cable line 14 and telephone line 18. Can be obtained by the processor 60 that starts the communication.

  The processor 22 receives the table ID and PID (or, eg, TCP / IP identifier, SCID, etc.) of incoming packets provided by the unit 17 (or units 72, 74 and 78 for Internet, cable or satellite data sources). Other data identifiers) are checked against the table ID and PID values preloaded by the processor 60 into the control registers in the unit 22. In addition, the processor 60 accesses, analyzes and assembles the program specific information packet captured by the processor 22 and stores the program specific information in its internal memory.

  In obtaining and processing a hierarchical structure table containing program specific information for the selected subchannel (SC), the processor 60 uses the process described above in FIG. The processor 60 cooperates with the decoder 100 to detect a mismatch by comparing the version number of the program specific information table with the version number corresponding to the version number carried in the MGT. In response to detecting the mismatch, the processor 60 forces the VCT version number to match the corresponding version number carried in the MGT. For this purpose, the processor 60 replaces (or rewrites) the VCT version number carried within the MGT with the VCT version number carried within the VCT itself. Therefore, when the validity check of MGT and VCT is subsequently executed, the version numbers match and the channel information from the VCT can be used for subsequent channel acquisition. The processor 60 also verifies the packetized program information captured for error indication. In particular, the processor 60 verifies the packetized program information (including program specific information) for MPEG continuous count errors, MPEG discontinuous errors, and MPEG transport errors, and further provides a continuous presentation time stamp (PTS). Verify that there are no excessive fluctuations. The processor 60 updates the internal database to indicate that detection of an error or table version number mismatch condition is associated with the subchannel (SC) and its corresponding physical transmission channel.

  The processor 60 prohibits the decoder 100 from decoding the packetized program information of the physical transmission channel associated with a version number mismatch or other error condition indicated in the database. Thus, if the version numbers are forced to match in advance and no error condition is detected, the decoder 100 provides a video or audio program that is decoded on the display 50 or audio device 55 to decode the packetized program information. The processor 60 also uses the database to delete channels associated with version number mismatches or error conditions from the user's channel lineup and electronic program guide (EPG) list.

  In response to the channel SC selection command from the remote unit 70 via the interface 65, the processor 60 retrieves tuning parameters including the PTC carrier frequency, demodulation characteristics, and subchannel PID from the acquired program specific information. The processor 60 uses this information to configure the units 13, 15, 17 and the elements of the decoder 100 to acquire the content of the selected subchannel (SC) program.

  The packetized decoded transport stream input from unit 17 (or units 72, 74 or 78) to decoder 100 includes, for example, video, audio and data representing a TV program, and further sub-picture data. Sub-picture data includes image elements associated with programs and channels that can be selected by the user for viewing, including, for example, multimedia objects, program guides, display commands, subtitles, selectable menu options or other items. . Accordingly, the sub-picture data includes an EIT including a description list of programs (events) that can be received by the sub-channels listed in the VCT, and further includes an EIT including a text message describing the program and the sub-channel of the program. Including.

  Video, audio, data and sub-picture data being transmitted over the terrestrial subchannel (SC) works with unit 22 along with associated data from satellite, cable or internet sources from units 74, 78 and 72 Obtained by the processor 60. This is accomplished using the matched program specific information. The processor 60 identifies video, audio, data and sub-picture data using each PID (or other identifier) determined from the VCT and the descriptor. The processor 60 also initiates communication with other data sources (eg, cable, satellite, or internet sources) and obtains video, audio, data, and sub-picture data from these sources.

  The processor 22 inputs the PID (or other identifier) of the incoming packet provided by the decoder 17 and the interface units 72, 74 and 78 on the subchannel (SC) and input via the communication lines 11, 14 and 18. To the identifier value of the video, audio and sub-picture data being recorded. Thus, the processor 22 captures the packets that make up the program transmitted on the subchannel (SC) and the corresponding data and multimedia objects (eg, advertisements, web page data, interactive icons, etc.). The processor 22 forms these packets into MPEG compliant video, audio and sub-picture streams for output to the video decoder 25, audio decoder 35 and sub-picture processor 30, respectively. The video and audio streams include compressed video and audio data representing selected subchannel (SC) program content. The sub-picture data includes multimedia objects and EIT and ETT information related to sub-channel (SC) program content and program guide information.

  The decoder 25 decodes and decompresses the MPEG-compliant packetized video data from the unit 22 and provides pixel data representing the decompressed program to the NTSC encoder 45 via the multiplexer 40. Similarly, the audio processor 35 decodes the packetized audio data from the unit 22 and provides decoded and amplified audio data synchronized with the associated compressed video data to the device 55 for audio playback. The processor 30 decodes and decompresses the sub-picture data including the multimedia object received from the unit 22 and provides multimedia objects, text, subtitles and graphics data representing the image.

  The processor 30 assembles and formats the decoded and decompressed multimedia objects, text, subtitles and graphics data and outputs them to an on-screen display (OSD) and graphics generator 37. Unit 37 interprets and formats the multimedia objects and other data from unit 30 and presents them to unit 50. The formatted pixel map text and graphics data may represent a multimedia object or program guide or other type of menu or user interface for subsequent display on the unit 50.

  Unit 37 also processes EIT, ETT, and other information to provide pixel map data representing subtitles, controls and information menu displays, including selectable menu options and other items for presentation to unit 50. Generate. Control and information display enable function selection and device operation parameter input for user operation of the decoder 100.

  Text and graphics generated by the OSD generator 37 are generated in the form of overlay pixel map data under the instruction of the processor 60. Overlay pixel map data from unit 37 is combined and synchronized with data representing the decompressed pixels from MPEG decoder 25 in encoder 45 via multiplexer 40 under the direction of processor 60. Thereby, multimedia objects such as advertisements, web page data, interactive icons, etc. can be included and displayed in the program content or program guide. The combined pixel map data representing the video program, its associated multimedia object, and its associated sub-picture text message data are encoded by NTSC encoder 45 and output to device 50 for display.

  In the storage mode of the system of FIG. 4, the corrected output data from unit 17 is processed by decoder 100 and an MPEG compliant data stream is provided and stored. In this mode, a program to be stored is selected by the user via the remote unit 70 and the interface 65. The processor 22 cooperates with the processor 60 to form compressed program specific information including MGT, VCT, EIT and ETT data. The compressed program specific information supports decoding of the program selected for storage, but excludes irrelevant information. The processor 60 operates in conjunction with the processor 22 to form a composite MPEG compliant data stream that includes packetized content data for the selected program and associated compressed program specific information. The composite data stream is output to the storage interface 95.

  The storage interface 95 buffers the composite data stream to reduce voids in the data and transmission rate fluctuations. The resulting buffered data is processed by storage device 90 to be suitable for storage on media 105. The storage device 90 encodes the buffered data stream from the interface 95 using well-known error encoding techniques, such as channel encoding, interleaving and Reed-Solomon encoding schemes, and a code suitable for storage. Generate a data stream. The unit 90 stores the encoded data stream generated in this way, which incorporates the compressed program specific information, on the medium 105.

  The architecture of FIG. 4 is not limiting. Other architectures can be devised in accordance with the principles of the present invention to achieve the same purpose. Further, the function of each element of the decoder 100 of FIG. 4 and the process steps of FIG. 3 may be implemented in whole or in part within the programmed instructions of the microprocessor. Furthermore, the principles of the present invention can be applied to any form of MPEG or non-MPEG compliant electronic program guide. Data streams formed in accordance with the principles of the present invention can be used in a variety of applications, including, for example, video server or PC type communications over telephone lines. A program data stream comprising one or more components of video, audio and data formed to incorporate program specific information in accordance with the principles of the present invention is recorded on a storage medium and other server, PC or reception Can be transmitted or rebroadcast to the machine.

Claims (3)

  1. Including ancillary program specific information comprising a plurality of information tables ordered hierarchically, a method for use in a system for decoding packetized program information of the ancillary program specific information, wherein It won and decoding packetized program information, Ru is used to provide a video program for display, the method,
    (A) version number incompatibility between the version number of the first table and the version number of the first table carried in the second table; (b) the auxiliary program specific information. detecting an error condition, at least one containing, fault conditions in the program information that is the packetized of the,
    That before Symbol detected transmission channel fault condition is associated with a step of instructing in the database,
    From displayable active channel line-up list of users, a method of comprising the steps excluding the transmission channel associated with the detected fault condition.
  2. The method of claim 1, wherein
    The decoding system is an MPEG decoding system;
    The error conditions in the auxiliary program specific information are : (a) MPEG transport error, (b) MPEG discontinuity error, (c) MPEG continuity count error, and (d) variation between successive time stamps. Including at least one of the errors indicated by.
  3. The method of claim 1, further comprising:
    The fault indication to the channel is associated with the fault condition, a method which comprises a table Shimesuru steps displayable channel in the line-up list of the user.
JP2010131081A 1999-07-13 2010-06-08 System for error management of program specific information in video decoder Expired - Fee Related JP4927198B2 (en)

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